Transcription of INTRODUCTION TO HUMAN DEVELOPMENT
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1 INTRODUCTION TO HUMAN DEVELOPMENTI nterest in HUMAN DEVELOPMENT is widespread largely because of curiosity about our beginningsand a desire to improve the quality of HUMAN life. The process by which a baby develops from asingle cell is miraculous and few events are more exciting than a HUMAN DEVELOPMENT is a continuous process that begins when an ovum is fertilized by a division, growth, differentiation, and even cell death, transform the fertilized ovum into amulticellular HUMAN being. Although important maturational changes continue to occur duringthe postnatal period (infancy, childhood, adolescence and even adulthood), the formation of theorgan systems occurs between fertilization and birth, the prenatal period.
Embryo: This term refers to the developing human during the early stages of development. The term is usually not used until the 2nd week, when a bilaminar (two layered) embryonic disc is formed. The embryonic period extends until the end of the eighth week, by which time all major structures and organs have formed.
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